Compressor



Apr. 24, 1923.

E. WILSON COMPRESSOR Filed Sept. 14 1921 2 Sheets-Sheet l Ap1n24, 1923.g 1 1,452,718

E. WILSON COMPRESSOR Filed Sept. 14 1921 2 Sheets-Sheet 2 lllll PatentedA r. 24, 1923.

UNITED STATES PATENT OFFICE.

EDWARD wILsoN, on em. LOUIS, MISSOURI, ASSIGNOR '10 wILsoN ENGINEERING.COMPANY, or s'r. LOUIS, MISSOURI, A coRPoaATIoN or MISSOURT' oomrnnssoa.

Application'filed September 14,1921. Serial No. 500,534.

T all whom it may concern:

Be it known that I, EDWARD WILsoN, a citizen of the United States,residing at St. Louis, Missouri, have invented a new and usefulCompressor, of which the following is a specification. v

This invention relates to compressors. An object of the invention is toprovide a compressor which is highly efiicient in its operation andwhich includes novel and improved valve mechanism for controlling thepassages leading from the compression chambers through thecylinderjstructure. Another object of the invention is to provide acompressor having oscillating pistons operating within a compressioncylinder, a novel system of passages leading through the cylinderstructure, I and valves controlling the same. v v Another object of theinvention'is to provide a compressor which is compact in as- 4 semblyand in which parts of the operating mechanism are enclosed'within astationary support and immersed in oil, and .in which the variousoperating parts, are-so arranged as to prevent excessive strains uponany of -'them. Other objects of the invention and numerous advantagesobtained thereby will be made apparent from the following descrip tion,reference being made to the accompanymg drawmgs, 1n wh1ch- Fig. 1 is aview partly 1n section and of a somewhat diagrammatic nature, showingvparts of the invention.

Fig. 2 is a cross sectional view on the l-ine 22 of Fig. 1'.

Fig. 3 is an end elevation of the piston device and the cylinder inwhich it operates. Fig. 4 is a sectional view on the line .4-4

of Fig. 3.

Fig. 5 is an elevation showing the inner side of one of the cylinder endwalls, the inner sides of both end walls being alike. Fig. 6 is asectional view on the line 6-6 of Fig. 5.

Fig. 7 is a sectional view on the line 7 7 3 0f 5. V I. Fig. 8 is a viewshowing .a part of the valve construction. a a The compressor,constituting the embodimentof my invention, is a compact arrangement inwhich the principal parts of the operat-ive mechanism are enclosedwithin a case The operative-mechanism of the compressor -wheel. A diskorflange 91s in rigid conis driven from a motor. In the embodiment ofthelinvention shown, the motor rotates a drive shaft having connectionsfor imparting oscillating or rocking movements to the piston shaft ofthe compressor by the continuous rotation of the rotary shaft in onedirection. The connections from the rotary shaft to the piston shaft arepreferably encased in a separate compartment from the compartment inwhich the compressor mechanism is enclosed.

As shown the base 1 constitutes the support for the compressor and forthe motor 2.

is mounted upon the base 1 andis provided support for the rotary shaftof the compressor. The rotary shaft 5 is journaled for rotation inanti-friction bearings 6 s'upported by the end wall 5, and is connectedwith the .motorshaftby an appropriate coupling 7. The inner side of theend wall 4 is dished or recessed to receive the ring 8 of the flynection with the inner end of the shaft 5 and is attached to the ring 8of the fly wheel. The fly wheel not only functions as such but alsoserves as a part of' the connections for imparting oscillating orrocking movements to' the compressor shaft by continuous rotation of theshaft 5 in one direction.

' The disc 9 supports a wrist pin 10 eccentrically with respect to theaxis of the shaft5'.

The wrist pin 10 constitutes a support for an anti-friction bearing 11upon which an arm 12 is mounted for rotation.

The oscillatingor rocking piston shaft .13 has one end extending intothe compartment in which the connections from the shaft 5 to said shaft13 are contained. The end of the shaft. 13 in said compartment'isequipped with' an arm 14 overlappingthe'endf of the arm 12 and connectedtherewith by anantifriction pivot device 15. By this constructionoscillatingor rocking movements are 'impartedto the shaft 13 by thecontinuous rotation of the shaft 5 in one direction.

The support 10'- for the arm 12 rotates with a removable end wall 4,constituting a )tion wall 16 dividing the interior of the housing intotwo compartments. One of the compartments contains the connections fromthe shaft 5 to the shaft 13, and the other compartment contains thecompression device.

The partition wall 16 is formed with an opening near the bottom of thehousing. In said opening a bearing support 17 1s s'ecured, said supporthaving a hole through its center through which the shaft 13 extends. Thebearing support 17 sustains the antifriction bearing 18 for one end ofthe shaft 13. The bearing 18 is within the compartment containin theconnections from the shaft 5 to the s aft 13.

The opposite end of the shaft 13 is sup ported by an anti-frictionbearing 19 carried by a removable end wall 20 for the housing 3. 'Theend wall 20 supports an air chamber 21 into which air is admittedthrough an inlet 22 and from which the air passes into the opening orpassage 23 in the hollow shaft 13. The outerend of the shaft 13 extendsthrough the end wall of a cylind'rical member 24 which opens into theair receiving chamber 21. A nut 25 screws onto the end of the shaft 13and clamps the end of the cylindrical member 24 against the in ner ringof the anti-friction bearing 19, which is also abutted against one ofthe'end walls of the compression cylinder.

In the construction'shown a cylinder 26 is in rigid connection with theremovable end wall 20. A non-rotative cylinder 27 is mounted in thecylinder 26, but is capable of axial movements Within the supportingcylinder 26 in order to maintain perfect adjustment of the parts and topermit the parts to be adjusted in accommodation to each other.

The cylinder 27, is provided with one or more compression chambersformed by inwardly extending sectors (Fig. 3) whose innerv ends contactwith the rocking piston shaft 13. The inner end of each of thesectors'28'is formed with a longitudinal groove in which a packingelement 29 is located. The packing elements 29 extend, the full lengthof the sectors 28 and have longitudinal channels in their outer sidescontaining springs 30 which press the packing elements in close contactwith the eriphery of the shaft 13 to form perfect seal to prevent airfrom passing thereby. The springs 30, as shown, are appropriately curvedleaf springs having their ends bearing against the packing elements, andtheir arched or curved centers bearing against the bottom walls of thegrooves in the sectors 28. The shaft 13 is provided'with grooves 31extending the full ength of the compression chambers: The grooves 31 areformed so that at the end of the turning movements of the shaft 13 thepacking elements 29 overlap the grooves. In the position of the shaft 13shown in Fig. 3,

each of the packing elements 29 overlaps one of the grooves 31, and whenthe shaft 13 reaches the end of its turning movement in the oppositedirection the packing elementsthe formation of ridges or irregularitieson the periphery of the shaft by the packing elements. 1

The pistons are in the form of sectors 32 integral with the shaft 13 andarranged to operate within the compression chambers in the cylinder 27.The outer ends of the sectors 32 have the same curvature as the outerwalls of the chambers within which the piston sectors operate, and areprovided with longitudinal grooves containing packing elements 33actuated by springs34 similar to the springs 30 which actuate thepacking elements 29. The packing elements 33 are pressed by the s rings34 into contact With the outer wall s of, the compression chambers toform perfect seals and prevent the air from passing thereby. Thecylinder 27 has two longitudinal grooves 35 in each compression chamberlocated at the ends of the movement of the packing elements 33, so thatsaid elements 33 will overlap the grooves 35 when the pistons 32 are atthe end of the their strokes. The presence of these grooves 35 preventsthe packing ele ments 33 from wearing ridges or irregulari ties on theinner surface of the cylinder 27.

The end wallsof the cylinder 27 comprisediscs 36. The disc 36 at theouter end of the cylinder27 has a hub contacting with the nner ring ofthe bearing 19. The outer disc '36 is keyed to, and rocks with, theshaft 13.

The disc 34 at the inner end of the cylinder 27 is attached to thepistons 32 by screws 37 passing through said disc and engaging-inthreaded holes in the "pistons. A compression ring or gland 38 encirclesion the shaft 13 between the inner disc 36 and i affords the desiredlubrication and also cooperates with said elements to form perfect sealsto prevent the passage of air thereby.

Air entering the passage 23 in the shaft 13 is admitted into thecompression chambers. In the embodiment of the invention munication-fromthe passage 23 in the shaft 13 to passages 43 in the discs 36. Since thediscs 36 cannot turn relative to the shaft l3,'the passages 43 arealways in communication with the passage 23. From the pas-j sage 43openings 44 'are'provided to admit the air into the compressionchambers. The passages 43 and the openings 44 therefrom are alike inboth discs 36. The passages 43 are arranged so that they alternate inadmitting air into the different compression chambers. As shown in Fig.3, the lower passage 43 is admitting air into one compression chamberwhile the opposite passage 43' is admitting-air into the other com-.

pression chamber. When the pistons 32 move in a' counter-clockwisedirection, as

shown in Fig. 3, the discs 36 move there with and the passages 43tmovearound, so that the lowerpassages 43 are brought into communication withthe other compression chamber while thetupper passages 43 move aroundinto communication with the com-' pression'chamber with which the lowerpassa es were previously in communication.

ompresslon is effected by both pistons 32 on every stroke sothat-thereis no lost motion or idle operation thereof. Each disc 36 is providedwith two annular recesses 45 which function as passages through whichthe compressed air passes from the compression chambers through thevalve controlled;

outlets, as will now be described. 1

Each sector 28 of the stationary cylinder 27 has a valve controlledpassage therein with which the passages 45 are alternately brought intocommunication. As shown, each sector 28 is formed with a recess 46 (Fig.4) opening at one end through a plate 47 embedded in the .end of thesector. the rocking of the pistons and the discs 36, the passages 45.are alternately-moved into and out of communication with the openingsthrough theplates 47. This communication is effected as the pistons 32approach the ends of their strokes, so that the compressed air passesfromthe compression chambers throughthe passages'45, through'theopenings in the plates 47, into the recesses 46, and out-throughopenings 48 into a chamber 49 .between the cylinders 26 and 27,.whichopens into the casing or housing 3 at the top (Fig. 1)' above the levelof theoil. Within each recess 46 a valve 50 is located and pressed toclosed position by a spring 51. The spring 51 in each recess is properlyretained and guided by a retainer member 52 of smaller diameter than thediameter of the recess so as. not to interfere with the outlet passage.

jections 53 extending from radial arms 54 integral with the springretainer. The valve 50 is within the annular series of tongues so thatwhen'the'valve 50 is'pressed to open' position by the pressure of theair within the compression chamber, the air will pass between saidtongues or projectionsand fence around the spring retainer 52 throughthe opening 48. The radial arms 54 engage a shoulder in the recess 46-tosupport the spring retainer rigidly.

The two discs 36 are of duplicate construction but the passages in oneof said discs cooperate with one of the valve controlled outlet passagesin the manner described, while the passages 45 in the other disc 36cooperate with the "other valve controlled Thus, while theconstruction'of the discs is 'the same, they occupy reverse oroppositepositions relative to the pistons and the other parts of the. machine.Each of the discs 36 is formed with a pair of pressure relief passages55, the inner ends of which open into the passage 43 passage of the air.The springretainers 52 also serve to retainand guide the valvesproperly. For this purpose. the spring retainers 52 are formed attheir-valved ends and the outer ends of which are arranged tocommunicate alternately with passages 56 branching from the openingsthrough one of the plates 47. The relief passages are constructed andarranged so that at or about the time that the pistons 32 complete theirstrokes, one of the passages 55 in one disc 36 communicates withthe'branch 56, while '1.

one of the passages 55. in the other disc 36- communicates with thebranch 56 of the other outlet passage, thus admitting the compressed airfrom the passages 45 and from the openings in the plates 46 into saidpassages 55.. This will relieve the pressure against the. influent sideof the valves 50',-

'due to the fact that, at the time this occurs,

the passages 55 that are in communication with the branch passages 56(Fig; 3), also communicate with the respective compression chambers aswell as with the passage .23. Such communication is through the passages43 into which the passages 55 open. Thus, at the end of each compremion,the pressure against the influent sides of the valves 50 is relieved,permitting the valves to be closed quickly by the action of theirsprings 51 as well as by the pressure of the compressed air against theeffluent sides of the valves.

.imparts a continuous rotary motion to the shaft 5 which. by theconnections therefrom, imparts rocking movements to the piston shaft 13and to the pistons 32. The'discs 36 are rocked with the shaft 13 and the.In operation the running of the motor 2 j with therespectivecompression chambers in 7 the cylinder 27. Air isthus-admitted i'nto a pipe 57. In order to effect instant closing of thevalves 50, themelief passages 55-56 are provided and ,function in themanner described.

' From the foregoing it will be seen that my invention completelyobtains all of its intended purposes and objects. The machine is highlyeflicient and is practically noiseless in operation and is practicablefrom every standpoint. v

I do not restrict myself to unessential features or limitations but whatI claim and desire to secure by Letters Patent is 1. A compressor,comprising-a cylinder, radial sectors extending inwardly from thecylinder, pistons within the cylinder between the radial sectors, andmechanism for imparting relative rocking movements between the cylinderand the pistons; in combination with end walls for the cylinder securedto the rocking part, air inlet passages through the end walls foradmitting air into the cylinder between said pistons and said sectors,air outlet passages from the cylinder formed in part in the end wallsand in part in said sectors, and valves 1n 'said outlet passages in thesectors permitting compressed air to pass from the cylinder through saidpassages. Y

2. A compressor, comprising a cylinder,

cylinder, pistons within the cylinder be.-

-tween the radial sectors, and mechanism for imparting relative rockingmovements between the cylinder and the pistons, in combination with endwalls for the cylinder secured to the rocking part, air inlet pas-'sagesthrough the end walls for admitting air into the cylinder betweensaid pistons and said sectors, air outlet passages from the cylinderformed in part in the end, walls I and in part in said sectors, valvesin said outlet passages in the sectors permitting radial sectorsextending inwardly from the' compressed air to pass from the cylinderthrough said passages, means'rfor relieving the pressure against-theefliuent sides of said valves, and springs for closing said valves,

3. A compressor comprising a housing, a stationary cylinder withinthe-housing, a

rocking piston within the stationary cylin der', end walls for thecylinder arranged to rock with the piston, air vinlet passages throughthe end walls-for admitting air into the cylinder, anda valve controlledoutlet cylinder into compression chambers, pistons in connection withsaid shaft in said chambers respectively, end walls for the non-rotativecylinder arranged to rock with the pistons, an air inlet passage in theshaft, passages in the end walls communicating with the air inletpassage in the shaft and arranged to communicate with the compressionchambers respectively and successively, air outlet passages in saidsectors, and passages in the end walls arranged to communicaterespectively and successively with the passages in said sectors topermit compressed air to pass from the compression chambers.

5. A compressor, comprising a housing, a

stationary cylinder within the housing, a non-rotative cylindersupported within the stationary cylinder, a shaft extending through thenon-rotative cylinder, sectors in connection with the non-rotativecylinder extending to said shaft and dividing said cylinder intocompression chambers, pistons in connection with said shaft in saidchambers respectively, end walls for the nonrotative cylinder arrangedto rock with the pistons, an air inlet passage in the shaft, passages inthe end walls communicating with the air inlet passage in the shaft andaranged to communicate with the compression chambers respectivelyandsuccessively, air outlet passages in said sectors, passages in theend -walls arranged to communicate respectively and'successively withthe passages in said sectors to permit compressed air to pass from thecompression chambers, a valve in each of the passages in saidsectorsarranged to be opened by the pressure 7 valves. V v,

6. A compressor, comprising ahousing, a-

stationary cylinder within the housing, a

non-rotative'cylinder supported within the a stationary, cylinder, ashaft extending through the non-rotative cylinder, sectors in connectionwith the non-rotative' cylinder extending to said shaft and dividingsaidcylinder into compression chambers, pistons in connection with saidshaft in said chambers respectively, end walls for the non-rotativecylinder arranged to rock with the pistons, an air inlet passage in theshaft,

passages in the end walls communicating with the air inlet passage inthe shaft and arranged to communicate with the compresrespectively andsuccessively with the pas:

sages in said sectors to permit compressed air to pass-from thecompression chambers, a valve in each of the passages in said sectorsarranged to be opened by the pressure of the compressed air within-thecompression chambers, springs for closing said valves, and pressurerelief ports for relieving the pressure against the influent sidesofsaid valves to permit said springs to effect quick closing, of thevalves andtoprevent return ofthe compressed air into the compressionchambers.

7. A compressor, comprising a housing ar ranged to contain 011 in thelower portion thereof, a stationary cylinder supported within thehousing-partly below the level of the oil, a non-rotative cylindersupported within the stationary cylinder and being capable of axialmovement therein, a shaft extending axially through the non-rotativecylinder, sectors extending from the nonrotative cylinder to theshaftdividing the interior of said cylinder into compression chambers,pistons in said shaft in said com-- pression chambers respectively,mechanism for rocking said shaft and thereby said pistons, end walls forthe non-rotative cylinder arranged to rock with said shaft and with saidpistons, passagesin the endwalls arranged to communicate with saidcompression chambers respectively and successively,

air outletpassages from the compression chambers, and valves controlling'said air outlet passages arranged to open by the pressure of the airwithin the compression chambers. p a

8. A compressor, comprising a housing arranged to contain oil in the.lower portion thereof, a stationary cylinder supported within thehousing partly below the level of the oil. a non-rotative cylindersupported within thestationary cylinder and being capable of axialmovement therein, -a shaft extending axially through the non-rotativecylinder, sectors extending-from the nonrotative cylinder to the shaftdividing the interior offsaid cylinder'into compression chambers]; pstons on said shaft 1n said compression chambers respectively,

mechanism for rocking said shaft and thereby said pistons, end; wallsfor the non-,

rotative cylinder arranged to rock with said shaft and with saidpistons, passages in the end-walls arranged to comrespectively andsuccessively, air outlet passages from the compression chambers, valvescontrolling saidair outlet passsages arranged to open by the pressure ofthe air within the compression chambers, springs for holding said valvesin closed positions and arranged to yield to permit said valves to beopened by the pressure of the air within sides of said valves about thetime that the 0 compressed air has been forced from said chambers. I

9. A compressor, comprisinga housing, a non-rotative cylinder supportedwithin the housing, compression chambers within the non-rotativecylinder, a shaft extending axially through said cylinder, pistons onsaid shaft insaid compression chambers respectively, mechanism forrocking said shaft and thereby said pistons, end walls for the 30cylinder arranged to rock with said shaft and with said pistons, airinlet passagesv in said end walls for admitting the air into saidcompression chambers, and air outlet passages opened and closed by saidend walls 35 as an incident to the rocking movements of said end wallsto permit said pistons to effect compression 1n said chambers andtopermit the compressedair to pass from said compression chambers at theproper time.

10. A compressonjcomprising a cylinder, compression chambers within thecylinder, ashaft extending axially through the cylinder, pistons on theshaft within the compression chambers, mechanism for rocking the shaftand the pistons to effect compression within the compression chambers,passages for conducting the compressed air from the compressionchambers, and end walls for the cylinder controlling the passage ofc'ompressed air from said chambers. V

11. A compressor, comprising a cylinder, compression chambers within thecylinder,

a shaft extending axially through the cylinder, pistons on the'shaftwithin'said com- 9 pression chambers, mechanism for rocking the shaftand the pistons to effect compression within the compression chambers,passages for conducting the compressed air from'the compressionchambers, end walls pressure of the compressed air within thecompression chambers to permit the com: o

pressed air to pass from the compression 7 chambers through saidpassages, and means J for relieving the pressure against the influentside of said valves after the compressed air 120.

has passed from the compression chambers.

12. A compressor, comprising a cylinder, compression chambers within thecylinder, a shaft extending axially through ,the cylinder, pistons onthe shaftwithm said com- 1 pressio n chambers, mechanism for rocking theshaft and the pistons to-efl'ect compression within the compressionchambers. passages for conductin the compressed air from the compressionchambers, end walls for the compression chambers controlling'the passageof the compressed air from the com-" pression'chambers into saidpassages, valves in said passages arranged to be opened by the pressureof the compressed air within the compression chambers to permit thecompressed air to pass from the compression chambers through saidpassages, means for relieving the pressure againt the 'influent side ofsaid valves after the compressed air has passed from the compressionchambers, and means for effecting quick closing of the valves when thepressure against the influent side thereof is relieved to prevent thecompressed air from turning into the compression chambers.

13. A compressor, comprising a cylinder, radial sectors extendinginwardly from the cylinder, compression chambers in the .cylinderbetween the radial sectors, a shaft extending axially through thecylinder and forming the inner walls of the compression chambers,pistons on the shaft inthe compression chambers respectively, mechanismfor rocking said shaft and said pistons to effect compression in thecompression chambers, and end walls for the compression chamberscontrolling the admission of air" the compression chambers, end wallsfor the compression chambers controlling the admission of air into thecompression chambers, passages for conducting the com pressed air fromthe compression chambers, means whereby the end walls control theadmission of the compressed air into said passages, and' means forpreventing the compressed air from returning into the compressionchambers through said passages.

15. A compressor, comprising a cylinder,

compression chambers within the cylinder, a

shaft extending axially through the cylinder, pistons on the shaftwithin the compression chambers, mechanism for rocking the shaft and thepistons to effect compression within the'compression chambers, and endwalls for the compression chambers controlhug the admission of air intosaid compression chambers and controlling the discharge of thecompressed air from the compression chambers.

16. A compressor, comprising a cylinder, compression chambers within thecylinder, a shaft extending axially through the cylinder, pistons on theshaft within the compression chambers, mechanism for rocking the for thecompression chambers controlling the admission ofair into saidcompression chambers and controlling the discharge of the compressed airfrom the compression chambers, means for operating the end walls toadmit air into the compression chambers and to permit compressed air topass from the compression'ehambers, and valves preventing the return ofcompressed air into the compression chambers.

17. A compressor, comprising a cylinder, a shaft extending axiallythrough the cylinder, radial sectors in connection with. the cylinderextending to the shaft, compression chambers in the cylinder betweensaid sectors, pistons on the shaft within the compression chambers,passages for admitting air into the compression chambers, passages forconducting the compressed air from the compression chambers, end wallsfor the compression chambers controlling said passages, and means foroperating said end walls to admit air into the cylinders through theadmission passages and to permit compressed air to pass from thecompression chambers through the other passages mentioned.

18. A compressor, comprising a cylinder, a shaft extending axiallythrough the cylinder, radial sectors in connection with the cylinderextending to the shaft, compression chambers in the cylinder betweensaid sectors, pistons on the shaft within the compression chambers,passages for admitting air into the compression chambers, passages forconducting the compressed air from the compression chambers, end wallsfor the compression chambers controlling said passages, means foroperating said end walls to admit airinto the cylinders through theadmission passages and to permit compressed air to pass from thecompression chambers through the other passages mentioned. valvemechanism preventing the compressed air from returning into thecompression. chambers, and means for controlling said valve mechanism.

19. A compressor, comprising a stationary cylinder, a non-rotativecylinder. supported within the stationary cylinder fdr axial adjustingmovements, a shaft extending axially through the non-rotative cylinder,sectors extending inwardly from the non-rotative cylinder to the shaft,compression chambers between said sectors, pistons on said shaft in saidcompression chambers, mechanism for rocking the shaft and the pistons toeffect compression in the compression chambers, an end wall for thecompression chambers keyed to the shaft for rocking movements therewithand for axial adjust- "ing movements thereon, another end wall thepistons, passages controlled by said end walls and by said sectors foradmitting air into the compression chambers, and valved outlet passagesfor conducting the compressed air from the compression chambers.

20. A compressor, comprising a stationary cylinder, a non-rotativecylinder supported within the stationary cylinder for axial adjustingmovements, a shaft extending axially through the non-rotative cylinder,sectors extending inwardly from the non-rotative cylinder to the shaft,compression chambers between said sectors, pistons on said shaft in saidcompression chambers, mechanism for rocking the shaft and the pistons toeffect compression within the compression chambers, an end wall for thecompression chambers keyed to the shaft for rocking movements therewithand for axial adjusting movements thereon, another end wall for thecompression chambers attached to the pistons, passages controlled bysaid end walls and by said sectors for admitting air into thecompression chambers, a receiving chamber between the non-rotativecylinder and the stationary cylinder, passages for conducting compressedair from the com- )ression chambers into the receiving chamer, andpassages in the end walls for conducting the compressed air from thereceiving chamber into said last-named passages.

21. A compressor, comprising a stationary f cylinder, an axially movablenon-rotative cylinder within the stationary cylinder, a compressed airreceiving chamber between said two cylinders, compression chamberswithin the non-rotative cylinder, mechanism for effecting compressionwithin the compression chambers, end walls for the compression chambers,and passages controlled by said end walls for conducting the compressedair from the compression chambers into the receiving chamber.

22. A compressor, comprising a housing, a stationary cylinder within thehousing, a non-rotative axially adjustable c linder supported within thestationary cy inder, a receiving chamber between said two cylinders,compression chambers within the non-rotative cylinder, end walls for thecompression chambers, mechanism for effecting compression within thecompression chambers, air inlet passages for admitting air into thecompression chambers, means cooperating with the end walls forcontrolling admission of air into the compression chambers, and

means cooperating with the end walls controlling the discharge ofcompressed air from the compression chambers into the recelvingchambers.

23. A compressor, comprlslng a cylinder,

end walls for the cylinder, mechanism for effecting compression for thecylinder, inlet passages for admitting air into the cylinder, outletpassages for conducting the compressed air from the cylinder, and meansfor operating said end Walls to open and to close said passages tocontrol the admission of air into the cylinder and the discharge ofcomprexed air therefrom.

24. A compressor, comprising a cylinder, end walls'for the cylinder,mechanism for effecting compression for the cylinder, inlet passages foradmitting air into the cylinder, outlet passages for conducting thecompressed air from the cylinder, means for operating said end walls toopen and to close said passages to control the admission of air into thecylinder and the discharge of compressed air therefrom, valves in thepassages for conducting compressed air from the cylinders, and means foroperating said valves to closed position after the compressed. air hasbeen discharged from the cylinders to prevent the compressed air fromreturning to the cylinders.

25. In a compressor, the combination of a cylinder, compression chambersin the cylinder, a rock shaft having an air inlet passage therethrough,pistons on said shaft operating within said compression chambers toeffect compression therein, and end walls for said compression chambersoperated by said shaft and having passages therein in communication withsaid air inlet passage in said rock shaft to control the admission ofair in one of said chambers and the discharge of compressed air fromsaid chamber.

26. In a compressor, the combination ofa cylinder, compression chambersin the cyl inder, a rock sha'ft extending axially through the cylinder,pistons on said shaft in the compression chambers, and end walls forsaid compression chambers operated by said shaft and having passagescontrolling the admission of air into one of said chambers and thedischarge of compressed air therefrom.

27. In a compressor, the combination of a cylinder, compression chambersin the cylin- EDWARD WILSON.

